Indicates if column multi sort is allowed.

<div class="definition">
    Boolean, default = true
</div>

If multi sort is allowed, user can sort by more then one column at a time (holding ctl or cmd key). This property can be defined
during object creation:

<textarea class="javascript">
let grid = new w2grid({
    name      : 'grid',
    header    : 'Grid Header',
    multiSort : false,
    columns: [
        { field: 'recid', text: 'ID', size: '50px' },
        { field: 'lname', text: 'Last Name', size: '30%' },
        { field: 'fname', text: 'First Name', size: '30%' },
        { field: 'email', text: 'Email', size: '40%' },
        { field: 'sdate', text: 'Start Date', size: '120px' },
        { field: 'sdate', text: 'End Date', size: '120px' }
    ]
});
</textarea>

Or any time after the grid has been created:

<textarea class="javascript">
grid.multiSort = true;
</textarea>

Please note, you need to enable column sort when you define <span class="property">.columns</span> for the grid.
See <a class="argument" href="w2grid.columns">.columns</a> property for more information.